Defective fischertechnik lamps can be easily replaced by LED.
In order for the LED lamp fits into the fischertechnik building block, we use a 12 volt LED with integrated resistor.
Step 1: Remove Old Lamp
Remove the old lamp.
Step 2: Inserting the LED
Put in the 12 Volt LED. Bending the legs.
Step 3: Ready
Test the function.
If you want you can also use a 12 volt flashing LED.
You can use 5mm or 3mm LED.
The 5mm looks best.